<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>


</head>

<body>


<div id="app">

    <button @click="sayHi">
        点击我
    </button>

</div>


<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
    var vm = new Vue({
        el: "#app",
        data: {
            message: '你好帅哥'
        },
        methods:{
            sayHi: function () {
                alert(this.message)
            }
        }
    })
</script>

</body>
</html>